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Marge Bot pushed to branch master at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong style="font-weight: bold;"><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74b24a9b0084459b8aa426a502956bd332b4d0fb">74b24a9b</a></strong>
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<span> by Teo Camarasu </span> <i> at 2024-02-28T16:32:58+00:00 </i>
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<pre class="commit-message" style='white-space: pre-wrap; display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; border-radius: 2px; margin: 0; padding: 8px 12px; border: 1px solid #dcdcde;'>rts: avoid checking bdescr of value outside of Haskell heap
In nonmovingTidyWeaks we want to check if the key of a weak pointer
lives in the non-moving heap. We do this by checking the flags of the
block the key lives in. But we need to be careful with values that live
outside the Haskell heap, since they will lack a block descriptor and
looking for one may lead to a segfault. In this case we should just
accept that it isn't on the non-moving heap.
Resolves #24492
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1 changed file:
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<a href="#4f5ba3ce18ccc17ad367193f379aa61f4c9180a0">
rts/sm/NonMovingMark.c
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Changes:
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/74b24a9b0084459b8aa426a502956bd332b4d0fb#4f5ba3ce18ccc17ad367193f379aa61f4c9180a0"><strong style="font-weight: bold;">rts/sm/NonMovingMark.c</strong></a>
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<td class="line_content match" style="color: rgba(31,30,36,0.24); padding: inherit;" bgcolor="#fbfafd">@@ -2011,7 +2011,7 @@ bool nonmovingTidyWeaks (struct MarkQueue_ *queue)</td>
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<td class="old_line diff-line-num" data-linenumber="2011" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
2011
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<td class="new_line diff-line-num" data-linenumber="2011" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
2011
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC2011" class="line" lang="c"></span>
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<td class="old_line diff-line-num" data-linenumber="2012" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
2012
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<td class="new_line diff-line-num" data-linenumber="2012" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
2012
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC2012" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// See Note [Weak pointer processing and the non-moving GC] in</span></span>
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<td class="old_line diff-line-num" data-linenumber="2013" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
2013
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<td class="new_line diff-line-num" data-linenumber="2013" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
2013
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC2013" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// MarkWeak.c</span></span>
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<td class="old_line diff-line-num old" data-linenumber="2014" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
2014
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<td class="new_line diff-line-num old" data-linenumber="2014" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
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<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span id="LC2014" class="line" lang="c"> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">key_in_nonmoving</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">Bdescr</span><span class="p">((</span><span class="n" style="color: #333;">StgPtr</span><span class="p">)</span> <span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">key</span><span class="p">)</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">flags</span> <span class="o" style="font-weight: 600;">&</span> <span class="n" style="color: #333;">BF_NONMOVING</span><span class="p">;</span></span>
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<td class="old_line diff-line-num new" data-linenumber="2015" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="new_line diff-line-num new" data-linenumber="2014" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
2014
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC2014" class="line" lang="c"> <span class="n" style="color: #333;">bool</span> <span class="n" style="color: #333;">key_in_nonmoving</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff left addition" style="background-color: #c7f0d2;">HEAP_ALLOCED_GC</span></span><span class="p"><span class="idiff addition" style="background-color: #c7f0d2;">(</span></span><span class="n" style="color: #333;"><span class="idiff addition" style="background-color: #c7f0d2;">w</span></span><span class="o" style="font-weight: 600;"><span class="idiff addition" style="background-color: #c7f0d2;">-></span></span><span class="n" style="color: #333;"><span class="idiff addition" style="background-color: #c7f0d2;">key</span></span><span class="p"><span class="idiff addition" style="background-color: #c7f0d2;">)</span></span><span class="idiff addition" style="background-color: #c7f0d2;"> </span><span class="o" style="font-weight: 600;"><span class="idiff addition" style="background-color: #c7f0d2;">&&</span></span><span class="idiff right addition" style="background-color: #c7f0d2;"> </span><span class="n" style="color: #333;">Bdescr</span><span class="p">((</span><span class="n" style="color: #333;">StgPtr</span><span class="p">)</span> <span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">key</span><span class="p">)</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">flags</span> <span class="o" style="font-weight: 600;">&</span> <span class="n" style="color: #333;">BF_NONMOVING</span><span class="p">;</span></span>
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<td class="old_line diff-line-num" data-linenumber="2015" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
2015
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<td class="new_line diff-line-num" data-linenumber="2015" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
2015
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC2015" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="o" style="font-weight: 600;">!</span><span class="n" style="color: #333;">key_in_nonmoving</span> <span class="o" style="font-weight: 600;">||</span> <span class="n" style="color: #333;">nonmovingIsNowAlive</span><span class="p">(</span><span class="n" style="color: #333;">w</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">key</span><span class="p">))</span> <span class="p">{</span></span>
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<td class="old_line diff-line-num" data-linenumber="2016" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
2016
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<td class="new_line diff-line-num" data-linenumber="2016" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
2016
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC2016" class="line" lang="c"> <span class="n" style="color: #333;">nonmovingMarkLiveWeak</span><span class="p">(</span><span class="n" style="color: #333;">queue</span><span class="p">,</span> <span class="n" style="color: #333;">w</span><span class="p">);</span></span>
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<td class="old_line diff-line-num" data-linenumber="2017" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
2017
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<td class="new_line diff-line-num" data-linenumber="2017" style="width: 35px; color: rgba(31,30,36,0.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
2017
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #333238; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC2017" class="line" lang="c"> <span class="n" style="color: #333;">did_work</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">true</span><span class="p">;</span></span>
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